Had someone in a toyota drafting me on the interstate last week with plenty of places to go by safely (6 lane highway)... the guy was so close, I literally couldn't see his car in any of my mirrors. After about a mile of that I realized what he was doing and had enough. I did the right thing and slowed down to force him to pass... he didn't. Mr. prius then found out that certain vehicles with certain programming modifications can turn day into night as a tailgating deterrent.